Unlike Revolution R Community which is 100% free to everyone, our commercial-grade Revolution R Enterprise distribution bundles R with proprietary components from our development team, which are normally available only to paying subscribers. (Those subscriptions are the way we get income to keep the company going.) Those components include our full ParallelR libraries for parallel programming, enhanced for 64-bit Windows, and our R Productivity Environment with full code editing and visual debugging on Windows ... and there's more to come soon in our roadmap.
Today, we're making the full Revolution R Enterprise distribution available to anyone in the academic community, free of charge. You can read all the details in this page about the free academic download program. All you need to do is fill out a form attesting that you're a professor or a student at an accredited degree-granting institution, and you can download the Windows 32-bit, Windows 64-bit or RHEL 5 version, free of charge.
The only restrictions are that it's for use on a single-user workstation, and you won't have access to live technical support. (For universities/schools that full support on a server or cluster, subscriptions are still available.)
Since there's so much overlap between the R community and the academic community, this is just one more way for us to give back to the community. We want to make sure everyone in academia gets access to both R and all the extensions we've made to it, and will make in the future.
Revolution Analytics: Free Single-User Subscription to Revolution R Enterprise for the Academic Community